Formulaic language is one of the important areas in language education. In recent years, research about some language aspects and elements such as formulaic language and chunks have become one of the more impressive and operative parts of applied linguistics and second language learning/teaching. In writing skill, the lack of proper use of FL in real or display writing simply distinguishes non-native from natives. Therefore, we applied formulaic language in individualistic and collaborative writing classrooms. The results revealed that the instruction of formulaic language has statistically significant effect (F (2, 56) = 12.341, p < 0.05, η2 = .306). However, the difference between the experimental groups was not statistically significant. This study is helpful for writing teachers who want to increase the performance of their language learners. Also, the result of this study may be helpful for textbook developers, curriculum designers, and policy makers.Also, the result of this study may be helpful for textbook developers, curriculum designers, and policy makers. پرونده مقاله